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Choosing a Small Frost Free Fridge Freezer Frost can coat and build up in a freezer, causing less space for food items. It also covers vents and temperature sensors and makes the freezer work harder. Keeping humidity levels low and closing the freezer door securely, and making sure that the freezer door is closed at all times are crucial steps to avoid frost. But, these steps aren't always enough. Features Frost-free freezers do away with the need to manually defrost the interior